Class Size Ratio Calculator
Calculate mean pupils per class, minimum sections for your own capacity and expected totals; compare actual class rows and named scenarios. All calculations stay in this browser.
No institutional, staffing, capacity or full-time policy is inferred.
The balanced allocation is a model; actual class rows are analyzed separately.
Each actual row represents one class. The class-weighted mean includes empty classes; the pupil-weighted mean weights each class by its pupil count.
Enter all required values as nonnegative plain decimals; counts must be integers and divisors positive. At most 512 digits per numeric input. Names are required.
A QUICK WALKTHROUGH
How to use this tool
- Choose a calculation mode and give the scenario a name.
- Enter the active counts or add named actual classes.
- Calculate, inspect the full tables, and copy or download the fixed report.
Method
The balanced allocation is a model; actual class rows are analyzed separately.
Parsed values and formulas
Each actual row represents one class. The class-weighted mean includes empty classes; the pupil-weighted mean weights each class by its pupil count.
Frozen report
Exact fractions are retained when a decimal repeats. Enter all required values as nonnegative plain decimals; counts must be integers and divisors positive. At most 512 digits per numeric input. Names are required. No institutional, staffing, capacity or full-time policy is inferred.
GOOD TO KNOW
Common questions
Does this give a pupil–teacher ratio?
No. Classes and teachers are different denominators; this calculator has no teacher or staffing model.
How is a balanced class allocation shown?
For 101 pupils and 4 classes: one class has 26 pupils and three have 25. The exact mean is 25.25.